Automatic cut-off valve.



ML $67,963. Patentad Feb. I2, I90l.

` R. E. VAIL.

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RALPH EARNEST VAIL, OF MOUNT VERNON, OHIO.

iSPJECIIFICAUEION forming part of Letters Patent No. 667,963, dated February 12. 1901.

Application filed May 24, 1900.

To all whom t may concern:

Beit known that l, RALPH EARNnsT VAIL, a citizen of the United States, and a resident of Mount Vernon, in 'the county of Knox and State of Ohio, have invented a new and Improved Automatic Ou t-Oil Valve, of which the following is a full, clear, and exact description.

The invention relates to safety-valves used on the supply-pipes leading from natur-algas pipe-lines.

The object of the invention is to provide a new and improved cnt-off valve for gas or other liuid under pressure and arranged to regulate the supply of the fluid and to insure a free flow of the fluid as long as the tluid is under pressure and to at once shut ott` the ilow as soon as the pressure ceases, the device requiring manual readjustment on the part of the operator Wh en the pressure returns.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

./-l practical embodiment of the invention is represented in the accompanying drawings, forming a part of this` specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 a plan View of the improvement with the plugs removed. Fig. 2 is a sectional side elevation on the line 2 2 in Fig. l, and Fig. 3 is a like view of the same With parts in a different position.

The casing A of the valve is provided with an inlet B, an outlet O, and a chamber D, through `.vhich passes the fluid from the inlet B in order to reach the outlet O. The interiorot' the chamber D and the parts contained therein can be readily examined from time to time by unscrewing the plugs E E in the top ot the casing. A cylinder F screws in the bottom of the chamber D and connects at its open end with the inlet-pipe B, its closed end extending Within the chamber D, suitable ports or holes F being' formed in 'the side Wall of said cylinder to allow the fluid under pressure to pass from the inlet B, through the open end of the cylinder and the said ports F, into the chamber D.

In the cylinder F is mounted to reciprocate a piston G, extending, with its pistonrod G',

Serial No. 17,822. (No model.)

through the closed end of the cylinder F, and the outer end of said piston-rod G is connected with one end of a lever H, fulcrumed at H within the chamber D and engaging with its free end a lever H2, fulcrumed on a post H3, extending in the chamber D. The lever H2 is adapted to engage a collar I on the stem I2 of a valve I, normally held oit its seat I3 in the bottom oll the chamber D and connecting the latter with the outlet O. The lower end of the valve-stem I2 extends into a closed casing J, containing a pin K, reaching to the outside, to be taken hold of by the operator for moving the valve I upward off its seat and for engaging the collar I' with the free end of the lever H2 to support the valve I off its seat while the apparatus is in a normal Working position.

When the several parts are in a normal working position', as shown in Fig. 3, the Huid entering the inlet B under pressure passes through the cylinder F and its ports F'l into the chamber D and from the latter through the valve-seat I3 into the outlet C to the burner or other place ot' discharge. Then the pressure ceases, then the piston G in the cylinder F slides downward by its own weight and in doing so causes the piston-rod Gl to impart a swinging motion to the lever H, so that the latter disengages the lever H2, and said lever is now free to swing. 'Ihe valve I now drops to its seat, and thereby disconnects the chamber D from the outlet O at the same time that said chamber is cut oft' from the inlet B by the piston G passing over the ports F. When the pressure returns, the piston G is moved in the cylinder F, and the fluid can again pass into the chamber D, but is prevented from passing to the outlet O, as the valve I is seated on the valve-seat I3. 'lhus if the burnervalves are not shut off there is no danger to the occupants of a house upon the return of the fluid under pressure, as the valve I has to be moved od its seat by the operator ma nipulating the pin K, as above explained.

It is understood that the supporting and tripping device, consisting, essentially, of the levers H H2, is controlled by the piston G and normally supports the valve I off its seat, but allows the same to drop to its seat as soon as the pressure of the fluid ceases.

Having thus fully described my invention,

I claim as new and desire to secure by Letters Patentl. An automatic cut-O valve, comprising a easing provided with an inlet, a cylinder one end of which communicates with said inlet and provided with a peripheral aperture, a piston fitting into said cylinder tightly and movable therein beyond the said aperture so that the latter will be between the piston and the inlet, a connecting-chamber into which leads said aperture and provided with an outlet, a Valve controlling said out- ]et, and a tripping connection between the piston and the outlet-valve.

2. An automatic ent-off valve, comprising a casing having an inlet, an outlet, and a connecting-chamber, a cylinder open to the inlet, and having ports leading to said chamname to this specification in the presence of 3o two subscribing witnesses.

RALPH EARNEST VAIL.

Witnesses:

ALLEN FINK, GUY J. TORBING. 

